Electric-arc lamp.



Patnted Sept. 4, I900.

T. E. DRUHAN.

ELECTRIC ARC LAMP.

(Application filed Aug. 26, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

THOMAS E. DROHAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SIEMENS 82; HALSKE ELECTRIC COMPANY OF AMERICA, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 657,485, dated September 4, 1900.

Application filed August 26,1899- Serial No. 728,600. (No model.)

To all whom, it may concern.-

Be it known that I, THOMAS E. DROHAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Carbon-Clutches for Electric-Arc Lamps, (Case A, No. 268,) of which the following is a full, clear, concise, and exact description, reference being had to the ac- IO companying drawings, forming a part of this specification.

My invention relates to arc-lamps, and has for its object the provision of improved carbon feeding and controlling mechanism therefor.

r 5 My invention relates particularly to that class of feeding mechanism in which rollerclutches are employed for securing upper carbons in position and for releasing the same when the carbons are to be fed.

My invention has for its object the construction of an improvedform of carbon feeding and controlling mechanism wherein the parts are reduced in number and the efficiency of the mechanism is assured and whereby the cost of production thereof is cheapened.

In accordance with my invention I carry the roller upon a swinging arm and-provide electromagnetic means for actuating the arm to release the carbon,the said electromagnetic means permitting the arm to be restored to its normal position to effect a binding en gagement between the roller and the carbon. This engagement of the roller with the car- 3 5 bon is preferably direct, though I do not wish to be limited to this direct engagement. In the preferred embodiment of my invention I employ a hollow carbon-carrier in the form preferably of a tube, in which the carbon, o which is usually in the form of a pencil of circular cross-section, is contained, the arm upon which the roller is mounted being also carried by the, carbon-carrier. By a downward movement of the carbon-carrier the arm 5 is brought into contact with a stop, which causes the roller to be released from engagement with the carbon to permit the same to be fed.

I will explain my invention more particularly by reference to the accompanying drawings, in which- Figure 1 illustrates carbon-controllin g mechanism constructed in accordance with my in vention, the mechanism being shown partially in section. Fig. 2 is a horizontal sectional view on line 2 2 of Fig. 1. Fig. 3 is a side elevation of my improved mechanism. Fig. 4 is a sectional elevation on line 4 4 of Fig. 1, the carbon and roller being removed.

Like letters indicate like parts throughout the different figures.

I have in this instance shown a solenoid a as the feeding-electromagnet, the core Z) of the solenoid supporting the carbon-carrier 0. An extension at is provided at the lower end 6 of the carrier, this extension being preferably separately formed and adj ustably secured to the part c by a clamping-screw e, passing through ears projecting from the rear of the extension. This extension constitutes in the embodiment of the invention shown a supplemental roller-bearing portion and has an oblique slot f, whose opposed walls extend obliquely upward from the carbon, thereby more readily to guide the roller g, disposed within the said recess, away from and toward the carbon. A swinging arm h is provided, upon which the rolleror clutch member 9 is directly supported and preferably is bodily movable toward or away from the carbon. This arm is preferably pivoted to the carrier 0 and preferably directly to the extension cl thereof. When the arc becomes unduly elongated the upper carbon t' should be fed. When the are becomes abnormally long, the energization of the solenoid CL is weakened, allowing the core I) to descend, thereby permitting the carbon-carrier c, with the arm h, also to descend.

A stop 70 is provided in the path of the outer free end of the arm h, so that when the arm h descends with the carbon-carrier the downward movement of the outer end of the arm is checked, thereby causing the elevation of the outer end of the arm and the consequent release of the roller g from engage- 5 ment with the carbon, thereby permitting the carbon to feed. When the arc has reached its normal state, the strength of the magnet a is restored, the core thereof being drawn vertically up thereby, whereby the free end 00 of the arm h is removed from its engagement with the stop it and the roller again restored to its engagement with the carbon to prevent the same from feeding further and to hold the carbon in its newly-adjusted position. This engagement between the roller and carbon is preferably direct.

The roller 9 is preferably elongated, as shown, and is provided with end plates ZZ, between which the extension d is included, as shown most clearly in Fig. 2. The arm 7L is preferably bifurcated at its pivoted end, the bifurcated members being provided with slots or recesses m to receive the shaft of the roller. The oblique slot f aids the arm 7b in its function of guiding the roller toward and away from the carbon. The arm 7L in the embodiment shown constitutes a lever of the second class, the roller being interposed between the pivot of the arm and the stop 70.

The roller g I preferably make of insulating material, such as lava. This prevents anyarcing between the carbon and the roller, which I have found in practice is very objectionable, as such arcing with a metallic roller results in pitting the surface of the roller,

which again causes an unevenness in the feeding of the carbon.

While I have shown the arm h as being provided with an elongated recess for receiving the shaft of the roller, and while I have shown an oblique slot in the extension (Z of the carbon-carrier, it is obvious that a carbon-feeding mechanism having these features may be modified without departing from the spirit of my invention.

While I have shown and particularly described the preferred embodiment of my invention, I do not wish to be limited to the precise construction shown; but,

Having described my invention, I claim as new and desire to secure by Letters Patent 1. In an arc-lamp, the combination with a carbon-carrier, of a swinging arm carried by the carbon-carrier, a revoluble clutch member rotatably supported by and bodily movable with relation to the swinging arm adapted for engagement with the carbon, and electromagnetic means for releasing the said clutch member from engagement with the carbon,

substantially as described.

2. In an arc-lamp, the combination with a movable carbon-carrier, of an arm mounted on the earbon-carrier,a revoluble clutch member rotatably supported by and bodily movable with relation to the arm and rotatable with relation thereto adapted for engagement with the carbon, and means for actuating the arm for releasing the said clutch member from engagement with the carbon, substantially as described.

3. In an electric-arc lamp, the combination with a carbon carrier, of electromagnetic means for controlling the vertical position thereof, a swinging arm mounted on the carbon-carrier, a revoluble clutch member rotatably supported upon and bodily movable with relation to the arm toward and from the carbon and adapted for engagement with the carbon, and a stop for engaging the arm when the carbon -carrier is lowered upon undue elongation of the arc, whereby the arm is actuated to release the revoluble clutch member from engagement with the carbon to permit the same to feed, substantially as de scribed.

4c. In an electric-arc lamp, the combination with a carbon carrier, of electromagnetic means for controlling the vertical position thereof, an arm mounted on the carbon-carrier, a revoluble clutch member rotatably supported upon the arm and bodily movable with relation thereto toward and away from the carbon and adapted for engagement with the carbon, and a stop for engaging the arm when the carbon-carrier is lowered upon undue elongation of the arc, whereby the arm is actuated to release the revoluble clutch member from engagement with the carbon to permit the same to feed, substantially as described.

5. In an electric-arc lamp, the combination with a carbon-carrier, of a carbon adapted to be moved with relation to the carrier, electromagnetic means for controlling the vertical position of the carrier, a swinging arm, a revoluble clutch member rotatably supported upon the swinging arm, the carbon-carrier being provided with an oblique slot for receiving the said clutch member the said slot also affording engagement between the car bon and roller, and a stop for engaging the unmounted end of the arm upon the descent of the carbon-carrier to cause the clutch member to be released from its engagement with the carbon to permit the carbon to feed upon an undue elongation of the arc, substantially as described.

6. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carbon-carrier, an arm 7t pivoted at one end to the carboircarrier, a stop 7; for engaging the other end of the arm, and a clutch member in the form of a roller rotatably supported upon the arm, substantially as described.

7. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carbon-carrier, an arm 7t pivoted at one end to the carbon-carrier, a stop 7; for engaging the other end of the arm, and a clutch member in the form of a roller rotatably supported upon the arm, the said arm being provided with an elongated recess for receiving the shaft of the roller, substantially as described. I

8. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carbon-carrier, an arm 7t pivoted at one end to the carbon-carrier, a stop for engaging the other end of the arm, and a clutch member in the form of a roller engaged by the arm, an oblique slot being provided in the carbon-carrier for containing the roller to guide the same toward and away from the carbon, substantially as described.

9. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is:

adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carbon-carrier, a pivoted arm 7t mounted upon the carrier, a stop for engaging the arm, and a clutch member in the form of a roller rotatably supported upon the arm, substantially as described.

10. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carboncarrier, a pivoted arm h, a stop 70 for engaging the arm, and a clutch member in the form of a roller, rotatably supported upon the arm, the said arm being provided with an elongated recess for receiving the shaft of the roller, substantially as described.

11. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carbon-carrier, a pivoted arm h, mounted upon the carbon-carrier, a stop k-for engaging the arm, and a clutch member in the form of a roller engaged by the arm, an oblique slot being provided in the carbon-carrier for containing the roller to guide the same toward and away from the carbon, substaniially as described.

12. In an electric-arc lamp, the combination with a feeding-solenoid a having a core b, of a hollow carbon-carrier 0 adapted to contain the upper carbon of the lamp and in which the upper carbon is adapted to travel, the said carbon-carrier being provided with an oblique slot f, a roller g adapted to travel obliquely from and toward the carbon in the said slot, an arm h pivoted to the carbon-carrier and engaging the roller, and a stop k for engaging an end of the arm, whereby the arm is caused to remove the roller from engagement with the carbon upon the descent of the carboncarrier to permit the carbon to feed upon an undue elongation of the are, substantially as described.

13. In an electric-arc lam p, the combination with a feeding-solenoid at having a core I), of a hollow carbon-carrier 0 adapted to contain the upper carbon of the lamp and in which the upper carbon is adapted to travel, the said carbon-carrier being provided with an oblique slot f, a roller g adapted to travel obliquely from and toward the carbon in the said slot, a swinging arm h pivotally secured to the carbon-carrier and engaging the roller, an elongated recess being provided in the arm to receive the shaft of the roller, in which recess the said shaft is adapted to travel transversely, and a stop It for engaging an end of the arm, whereby the arm is caused to remove the roller from engagement with the carbon upon the descent of the carbon-carrier to permit the carbon to feed upon an undue elongation of the are, substantially as described.

14. In an arc-lamp, the combination with a carbon-carrier, of a swinging arm and a rollerclutch member of insulating material rotatably supported by and bodily movable with relation to the swinging arm adapted for direct engagement with the carbon, and electromagnetic means for releasing the said clutch member from engagement with the carbon, substantially as described.

15. In an arc-lamp, the combination with a carbon-carrier, of an arm and a roller-clutch member of insulating material rotatably supported by and bodily movable with relation to the arm adapted for direct engagement with the carbon, and electromagnetic means for actuating the arm for releasing the said clutch member from engagement with the carbon, substantially as described.

16. In an electric-arc lamp, the combination with a carbon carrier, of electromagnetic means for controlling the vertical position thereof, a swinging arm, a roller-clutch member of insulating material rotatably supported upon the arm and adapted for direct engagement with the carbon, and a stop for engage ing the arm when the carbon-carrier is lowered upon undue elongation of the arc,whereby the arm is actuated to release the revoluble clutch member from engagement with the carbon to permit the same to feed, substantially as described.

17. In an arc-lamp, the combination with a hollow carbon-carrier c in which a carbon is adapted to travel vertically, of electromagnetic means for controlling the vertical position of the carbon-carrier, an arm h pivoted at one end to the carbon-carrier, a stop 70 for engaging the other end of the arm, and a clutch member of insulating material in the form of a roller rotatably supported upon the 7 arm, substantially as described.

In witness whereof I hereunto subscribe my name this 22d day of August, A. D. 1899.

THOMAS E. DROHAN. Witnesses:

CHARLES A. BROWN, CHARLES E. HUBERT. 

